NONDESTRUCTIVE TESTING FOR BEARING CONDITION MONITORING AND HEALTH DIAGNOSIS

Nondestructive Testing (NDT) techniques assess the conditions of rolling bearings without affecting their structural functionality, thus have played an important role in bearing health diagnosis. Among the various NDT techniques investigated for bearing applications, vibration and acoustic-based techniques are the most popular, since vibration and acoustic signals measured from bearings contain physical information that directly reflect the defect severity. In this chapter, a review of such NDT techniques is presented, and related sensors and sensing principles are discussed.